Albendazole

# Albendazole ## Overview - **Classification**: Benzimidazole carbamate, Antihelminthic. - **Mechanism**: Inhibits microtubule formation in parasitic worms by binding to beta-tubulin, impairing glucose uptake and causing ATP depletion, leading to immobilization and death. ## Primary Indications 1. **Neurocysticercosis (NCC)** - Treatment of parenchymal, subarachnoid, and intraventricular cysts due to *Taenia solium*. 2. **Hydatid Disease (Echinococcosis)** - Treatment of cystic hydatid disease (*Echinococcus granulosus*) and alveolar hydatid disease (*E. multilocularis*). 3. **Other Helminthic Infections** - Ascariasis, hookworm, trichuriasis, strongyloidiasis, giardiasis (off-label). ## Adult Dosing ### Standard Dosing **Neurocysticercosis (NCC)** - **Dose**: **400 mg** - **Frequency**: Twice daily (BID) - **Route**: Oral - **Duration**: **8-30 days**, often with corticosteroids. **Hydatid Disease** - **Dose**: **400 mg** - **Frequency**: Twice daily (BID) - **Route**: Oral - **Duration**: **28-day cycles** followed by 14-day drug-free intervals, for 3 cycles or more. **Ascariasis, Hookworm, Trichuriasis** - **Dose**: **400 mg** - **Frequency**: Single dose - **Route**: Oral - **Special consideration**: Repeat in 1-2 weeks for enterobiasis. **Strongyloidiasis** - **Dose**: **400 mg** - **Frequency**: Once daily - **Route**: Oral - **Duration**: **3 days** ### Dose Adjustments - **Renal Impairment**: No specific dose adjustment required. - **Hepatic Impairment**: Use with caution. Monitor liver enzymes closely. Drug levels may increase. - **Elderly Patients**: No specific dose adjustment; monitor for adverse effects. ## Pediatric Dosing ### Neonates (0-28 days) - **Dose**: Not generally recommended due to limited data. - **Special Notes**: Consider risk vs. benefit in life-threatening situations only. ### Infants (1-12 months) - **Giardiasis (off-label, >6 months)**: - **Dose**: **400 mg** - **Frequency**: Once daily - **Duration**: **5 days** - **Other infections**: Use with caution, limited data for routine use. ### Children (1-12 years) - **Neurocysticercosis (NCC)**: - **Dose**: **15 mg/kg/day** (max **400 mg** per dose) - **Frequency**: Divided twice daily (BID) - **Maximum**: **800 mg/day** (adult max) - **Hydatid Disease**: - **Dose**: **15 mg/kg/day** (max **400 mg** per dose) - **Frequency**: Divided twice daily (BID) - **Maximum**: **800 mg/day** (adult max) - **Ascariasis, Hookworm, Trichuriasis (>2 years)**: - **Dose**: **400 mg** - **Frequency**: Single dose - **Strongyloidiasis (>2 years)**: - **Dose**: **400 mg** - **Frequency**: Once daily - **Duration**: **3 days** - **Giardiasis (>2 years)**: - **Dose**: **400 mg** - **Frequency**: Once daily - **Duration**: **5 days** ### Adolescents (13-18 years) - **Dose**: Adult dosing applies. - **Maximum**: Adult maximums (e.g., **400 mg** BID). ## Safety Information ### Contraindications - **Absolute**: Hypersensitivity to albendazole or its components. - **Absolute**: Pregnancy (known or suspected). - **Relative**: Pre-existing bone marrow suppression; severe hepatic impairment. ### Common Adverse Effects - **Very Common (>10%)**: Headache, nausea, vomiting, abdominal pain. - **Common (1-10%)**: Alopecia (reversible), dizziness, elevated liver enzymes. - **Serious but Rare**: Bone marrow suppression (leukopenia, agranulocytosis), acute renal failure, allergic reactions. ### Key Drug Interactions - **Dexamethasone**: Increases albendazole sulfoxide levels; may require dose adjustment. - **Cimetidine**: Increases albendazole sulfoxide levels. - **Praziquantel**: Increases albendazole sulfoxide levels. - **Theophylline**: Albendazole may decrease theophylline levels; monitor theophylline levels. - **Ritonavir, Carbamazepine, Phenytoin, Phenobarbital**: May decrease albendazole sulfoxide levels. ## Monitoring & Follow-up - **Before Treatment**: Complete blood count (CBC), liver function tests (LFTs). Pregnancy test for females of childbearing potential. - **During Treatment**: CBC and LFTs every 2 weeks (especially for prolonged therapy). - **Clinical Signs**: Monitor for fever, rash, easy bruising/bleeding, jaundice, or worsening neurological symptoms. ## Clinical Pearls - 💡 **Tip 1**: Administer with a fatty meal to significantly increase absorption. - 💡 **Tip 2**: For NCC/Hydatid disease, co-administration with corticosteroids often required to manage inflammatory reactions. - 💡 **Tip 3**: Advise women of childbearing potential to use effective contraception during and for 1 month post-treatment. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.